Japanese azalea Johanna
Japanese azalea Johanna
Japanese azalea Johanna
Japanese azalea Johanna
Rhododendron (Azalea) japonica Johanna
Japanese Azalea
Magnificent plant with lovely vivid red flowers.
Marie-Christine, 10/02/2026
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Description
The 'Johanna' Japanese Azalea, also known as Hybrid Rhododendron, is an evergreen upright shrub that stands out with its deep red flowers and dark green foliage. It will brighten up your borders and pots.
Originally from Japan, the 'Johanna' Azalea forms a small, dense bush with an upright habit, reaching 60 cm (23.6 in) in height and 50 cm (19.7 in) in width at maturity. Its persistent, ovate, glossy, and leathery leaves are dark green, turning purple in autumn. During the months of April and May, this small bush produces numerous trumpet-shaped flowers with a diameter of 5 cm. They are beautifully coloured in deep red. A highly anticipated event in the garden.
Hardy down to -17°C, the 'Johanna' Japanese Azalea prefers a bright exposure and should ideally be planted in partial shade, in a location protected from cold and dry winds. Slow growing, this small bush that thrives in cool, humus-rich, well-drained soil with acidic tendencies.
The 'Johanna' Azalea dresses up heathland borders all year round and brings gardens to life in spring with its colourful flowers. Plant it on a slope, in a shady rock garden, or at the edge of a border alongside Pieris, Heather, Kalmias, Andromedas, Chinese Azaleas, and Japanese Maple.
Divided into 2 horticultural groups, the Rhododendron genus includes, on one hand, both Chinese and Japanese Azaleas, with small persistent or deciduous leaves, each flower having 5 stamens, and on the other hand, Rhododendrons, with a large, persistent, glossy foliage and flowers with more than 10 stamens. Although highly debatable from a botanical point of view, this classification is still widely used by horticulture professionals.
Japanese azalea Johanna in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron (Azalea)
japonica
Johanna
Ericaceae
Japanese Azalea
Cultivar or hybrid
Planting and care
Plant the Japanese Azalea 'Johanna' in a semi-shaded position, protected from cold and drying winds, in cool, humus-rich, and light soil with an acidic tendency. Like all plants that prefer acid soil, it cannot tolerate limestone or heavy soil that become waterlogged in winter. Dig a hole three times larger than the pot. Soak the root ball in non-limestone water and plant the bush at its base level in a mixture of 1/4 each of turf, leaf compost, gravel or pumice, and loam. Water thoroughly and keep the soil moist in summer. Azaleas and Rhododendrons have shallow root systems, making them susceptible to long periods of drought. Therefore, it is advisable to enrich the soil with humus and provide abundant watering during dry periods. Additionally, their root system is not very strong, so it is essential to lighten heavy soil with draining materials (gravel, pumice, clay pellets) during planting. Apply a mulch of crushed pine bark around the base of the bush every spring to maintain soil moisture and an acidic pH. Maintenance involves removing faded flowers in summer and clearing dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils, which eat the edges of leaves and rootlets, as well as the infamous 'rhododendron beetle', which rarely causes severe damage. You can treat them with carbofuran. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor iron assimilation in the soil and can lead to premature death of the plant. While limestone is often the cause, poorly drained soil or planting too deep can also explain this phenomenon.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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